MEGAMCERA LONGIMANA. 



403 



AMPHIPODA. 



NAT ATOM A. 



GAM MA RIDES. 



MEGAMCERA LONGIMANA. 

 (Leach's Long-handed Screw.) 



Specific character. Second pair of gnathopoda having the propodos three 

 times as long as broad, with the superior and inferior margins parallel, the 

 latter finely serrated ; and the dactylos nearly as long as the propodos. 

 Posterior pair of pleopoda having the rami sub-foliaceous and equal. 



Length JA inch. 



Gammarus lonyimanus. 



Megamcera lonyimana. 



Gammarvs Icevis. 



Leach, MSS. in Collection Brit. Mus. Thompson, 



Ann. Nat. Hist. 1 ser. xx. p. 242. Nat. Hist. 



of Ireland, iv. p. 396. Spence Bate, Rep. 



Brit. Assoc. 1855, p. 58. Ann. Nat. Hist. 



2 ser. xix. p. 145. White, Hist. Brit. Crust. 



p. 184. Gosse, Mar. Zool. p. 141. 

 Spence Bate, Cat. Amph. Brit. Mus. p. 227, 



pi. xxxix. fig. 7. 

 Bruzelius, Skand. Amph. Gam. p. 60, pi. ii. 



fig. 10. 



This animal is long and moderately robust. The 

 inferior margins of the second and third segments of the 

 tail are serrated. The eyes are round. The superior 

 antennae are about half the length of the animal ; the 

 inferior are much shorter. The first pair of legs are 

 small, having the wrist and hand of nearly equal length. 

 The second pair of legs have the wrist short and inferiorly 

 produced to a point ; the lower margin is, moreover, 



d d 2 



